Based on the experimental results of the in situ horizontal well (IHW) repair system, a hydrogeochemical model of the one-dimensional dynamic reaction migration was established to study the denitrification performance of IHW under experimental conditions, which considered the growth and decay of microbial units. PHREEQC software was used to solve and calculate the model, and the material conversion process of nitrate and ethanol in groundwater under microbial denitrification was obtained. The results showed that during the reaction process, the microbial population showed a trend of gradually increasing and then slowly decreasing with the reaction process, and the change curve of microbial population approximately presented a “convex” shape. The growth rate of microorganisms gradually decreased with the consumption of nitrate and ethanol. The maximum hydraulic load of the IHW repair system is 4.88m³/(m²•d) when the nitrate concentration is 25 mg/L, and the maximum hydraulic load is 50 mg/L when the flow rate is 2.44 m³/(m²/d). It provides technical reference for groundwater nitrate in situ remediation project and practical guidance for site application.

基于原位水平井(IHW)修复系统的实验结果，建立了一维动态反应迁移的水文地球化学模型，研究了IHW在实验条件下的反硝化性能，考虑了微生物单元的生长和衰变. 采用PHREEQC软件对模型进行求解计算，得到微生物反硝化作用下地下水中硝酸盐和乙醇的物质转化过程。结果表明，在反应过程中，微生物种群随着反应过程呈逐渐增加然后缓慢减少的趋势，微生物种群的变化曲线近似呈“凸”形。随着硝酸盐和乙醇的消耗，微生物的生长速度逐渐降低。³ /(m ² •d) 硝酸盐浓度为25 mg/L时，最大水力负荷为50 mg/L，流量为2.44 m ³ /(m ² /d)。为地下水硝酸盐原位修复工程提供技术参考和现场应用实践指导。